OpenClaw WeChat Mini Program file storage functionality

Mini Programs that can't handle files are like offices without filing cabinets — technically functional, but painfully limited. Whether it's user-uploaded images, generated reports, or conversation attachments, your OpenClaw-powered Mini Program needs a solid file storage strategy.

Let's build one.

The File Storage Challenge

WeChat Mini Programs have strict limitations:

10MB max for local storage
No persistent filesystem — data disappears when the Mini Program is closed
Upload size limits vary by file type
Temporary URLs expire quickly

Your OpenClaw backend on Tencent Cloud Lighthouse becomes the persistent storage layer that the Mini Program itself can't provide.

Architecture Overview

Mini Program → Upload API → Lighthouse Storage → OpenClaw Processing
                                    ↓
                              File Metadata DB
                                    ↓
Mini Program ← Download API ← Lighthouse Storage

Setting Up the File Storage API

On your Lighthouse instance:

// /opt/clawdbot/api/file-storage.js
const express = require('express');
const multer = require('multer');
const path = require('path');
const crypto = require('crypto');
const fs = require('fs');

const app = express();
const STORAGE_DIR = '/opt/clawdbot/data/files';

// Configure upload handling
const storage = multer.diskStorage({
  destination: STORAGE_DIR,
  filename: (req, file, cb) => {
    const hash = crypto.randomBytes(16).toString('hex');
    const ext = path.extname(file.originalname);
    cb(null, `${hash}${ext}`);
  }
});

const upload = multer({
  storage,
  limits: { fileSize: 10 * 1024 * 1024 }, // 10MB
  fileFilter: (req, file, cb) => {
    const allowed = ['.jpg', '.jpeg', '.png', '.pdf', '.doc', '.docx', '.xlsx'];
    const ext = path.extname(file.originalname).toLowerCase();
    cb(null, allowed.includes(ext));
  }
});

// Upload endpoint
app.post('/api/files/upload', upload.single('file'), (req, res) => {
  if (!req.file) {
    return res.status(400).json({ error: 'No file uploaded or invalid type' });
  }
  
  const fileRecord = {
    id: path.parse(req.file.filename).name,
    original_name: req.file.originalname,
    size: req.file.size,
    mime_type: req.file.mimetype,
    uploaded_at: new Date().toISOString(),
    user_id: req.headers['x-user-id']
  };
  
  // Save metadata
  saveFileMetadata(fileRecord);
  
  res.json({
    file_id: fileRecord.id,
    download_url: `/api/files/${fileRecord.id}`,
    size: fileRecord.size
  });
});

// Download endpoint
app.get('/api/files/:fileId', (req, res) => {
  const metadata = getFileMetadata(req.params.fileId);
  if (!metadata) {
    return res.status(404).json({ error: 'File not found' });
  }
  
  const filePath = path.join(STORAGE_DIR, `${req.params.fileId}${path.extname(metadata.original_name)}`);
  res.download(filePath, metadata.original_name);
});

app.listen(3001, () => console.log('File storage API running on :3001'));

Mini Program Upload Integration

// pages/upload/upload.js
Page({
  chooseAndUpload() {
    wx.chooseMessageFile({
      count: 1,
      type: 'file',
      success: (res) => {
        const file = res.tempFiles[0];
        
        wx.uploadFile({
          url: 'https://YOUR_LIGHTHOUSE_IP/api/files/upload',
          filePath: file.path,
          name: 'file',
          header: {
            'x-user-id': wx.getStorageSync('userId')
          },
          success: (uploadRes) => {
            const data = JSON.parse(uploadRes.data);
            wx.showToast({ title: 'Upload complete!' });
            
            // Now send the file reference to OpenClaw for processing
            this.processWithAI(data.file_id, file.name);
          },
          fail: () => {
            wx.showToast({ title: 'Upload failed', icon: 'none' });
          }
        });
      }
    });
  },

  async processWithAI(fileId, fileName) {
    const res = await wx.request({
      url: 'https://YOUR_LIGHTHOUSE_IP/api/chat',
      method: 'POST',
      data: {
        message: `Please analyze the uploaded file: ${fileName}`,
        attachments: [{ file_id: fileId }]
      }
    });
    // Handle AI response about the file
  }
});

Storage Management

Keep your disk healthy with automated cleanup:

#!/bin/bash
# /opt/clawdbot/storage-cleanup.sh

STORAGE_DIR="/opt/clawdbot/data/files"
MAX_AGE_DAYS=30

echo "=== Storage Cleanup ==="
echo "Before: $(du -sh $STORAGE_DIR | awk '{print $1}')"

# Remove files older than 30 days
find $STORAGE_DIR -type f -mtime +$MAX_AGE_DAYS -delete

echo "After: $(du -sh $STORAGE_DIR | awk '{print $1}')"
echo "Cleaned files older than $MAX_AGE_DAYS days"

Schedule it weekly:

echo "0 3 * * 0 /opt/clawdbot/storage-cleanup.sh >> /var/log/clawdbot/cleanup.log 2>&1" | crontab -

Deploy on Lighthouse

Get your file storage backend running:

Visit the Tencent Cloud Lighthouse OpenClaw page to provision your instance.
Select the "OpenClaw (Clawdbot)" application template under "AI Agents".
Deploy by clicking "Buy Now" — your file storage infrastructure is ready.

Backup Strategy

Files are data. Data needs backups:

# Daily backup of uploaded files
tar czf /opt/clawdbot/backups/files-$(date +%Y%m%d).tar.gz /opt/clawdbot/data/files/

# Keep 14 days of backups
find /opt/clawdbot/backups/ -name "files-*.tar.gz" -mtime +14 -delete

Security Considerations

Validate file types server-side, not just client-side
Scan uploads for malware before processing
Generate random filenames — never use the original filename on disk
Set proper permissions: chmod 640 on uploaded files
Rate limit uploads to prevent storage abuse

# Set secure permissions on the storage directory
chmod 750 /opt/clawdbot/data/files
chown clawdbot:clawdbot /opt/clawdbot/data/files

Monitoring Storage Health

#!/bin/bash
echo "=== Storage Health ==="
echo "Total files: $(find /opt/clawdbot/data/files -type f | wc -l)"
echo "Total size: $(du -sh /opt/clawdbot/data/files | awk '{print $1}')"
echo "Disk free: $(df -h /opt/clawdbot/data/files | tail -1 | awk '{print $4}')"
echo "Largest files:"
find /opt/clawdbot/data/files -type f -exec du -h {} + | sort -rh | head -5

Next Steps

File storage turns your Mini Program from a chat interface into a full-featured application platform. Documents, images, reports — all managed through your OpenClaw backend.

Visit https://www.tencentcloud.com/act/pro/intl-openclaw to get your storage-ready instance.
Select the "OpenClaw (Clawdbot)" template under "AI Agents".
Deploy and give your Mini Program the file handling it deserves.

Files in. Intelligence out.